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Altivec detection on non-MacOS X systems

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This commit is contained in:
Sam Lantinga
2004-01-29 05:22:23 +00:00
parent 650b2062dc
commit 9aa13dea7e
1 changed files with 31 additions and 6 deletions
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37
src/cpuinfo/SDL_cpuinfo.c
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@@ -27,6 +27,12 @@ static char rcsid =
/* CPU feature detection for SDL */
#ifdef unix /* FIXME: Better setjmp detection? */
#define USE_SETJMP
#include <signal.h>
#include <setjmp.h>
#endif
#include "SDL.h"
#include "SDL_cpuinfo.h"
@@ -43,6 +49,17 @@ static char rcsid =
#define CPU_HAS_SSE2 0x00000080
#define CPU_HAS_ALTIVEC 0x00000100
#ifdef USE_SETJMP
/* This is the brute force way of detecting instruction sets...
the idea is borrowed from the libmpeg2 library - thanks!
*/
static jmp_buf jmpbuf;
static void illegal_instruction(int sig)
{
longjmp(jmpbuf, 1);
}
#endif // USE_SETJMP
static __inline__ int CPU_haveCPUID()
{
int has_CPUID = 0;
@@ -211,19 +228,27 @@ static __inline__ int CPU_haveSSE2()
static __inline__ int CPU_haveAltiVec()
{
int altivec = 0;
#ifdef MACOSX
/* TODO: This check works on OS X. It would be nice to detect AltiVec
properly on for example Linux/PPC, too. But I don't know how that
is done in Linux (or FreeBSD, or whatever other OS you run PPC :-)
*/
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
int hasVectorUnit = 0;
size_t length = sizeof(hasVectorUnit);
int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
if( 0 == error )
return hasVectorUnit != 0;
altivec = (hasVectorUnit != 0);
#elseif defined(USE_SETJMP) && defined(__GNUC__) && defined(__powerpc__)
void (*handler)(int sig);
handler = signal(SIGILL, illegal_instruction);
if ( setjmp(jmpbuf) == 0 ) {
asm volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
altivec = 1;
}
signal(SIGILL, handler);
#endif
return 0;
return altivec;
}
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;